Step 1

Open the .toml file for the ROM you are hacking in the text editor of your choice.

Do ctrl+f to open the find tool

Step 2

Type "evolutionmethods" into the search.

Click "Find Next" until you get to the list

Step 3

Select the entire list and replace it with the following:

0 = [
   '''None''',
   '''Happiness''',
   '''Happy Day''',
   '''Happy Night''',
   '''Level''',
   '''Trade''',
   '''Trade Item''',
   '''Stone''',
   '''Level High Attack''',
   '''Level Attack matches Defense''',
   '''Level High Defense''',
   '''Level Odd Personality''',
   '''Level Even Personality''',
   '''Level And New Pokemon''',
   '''Level But New Pokemon''',
   '''Beauty''',
   '''Rain Or Fog''',
   '''Move Type''',
   '''Type in Party''',
   '''Map''',
   '''Male''',
   '''Female''',
   '''Level Night''',
   '''Level Day''',
   '''Hold Item Night''',
   '''Hold Item Day''',
   '''Move Name''',
   '''Mon in Party''',
   '''Level Time Range''',
   '''Flag Set''',
   '''3 Critical Hits In One Battle''',
   '''Nature High''',
   '''Nature Low''',
   '''Damage Location''',
   '''Item Location''',
]
253 = [
   '''Gigantamax''',
   '''Mega''',
]

Happy Hacking!